"Well, I think one of the real big questions for evolutionary biology is how do the small scale evolutionary processes, genetics and things like that, function over large spans of time?" Darin Croft is a professor of anatomy at Case Western Reserve University . He teaches head and neck anatomy to medical students, but, he’s also a world-renowned expert on South American paleontology and paleo-mammals. "South America’s a really neat place if you’re interested in mammals because for most of the